Junping Du moved MAPREDUCE-5940 to YARN-2251:

    Component/s:     (was: webapps)
                     (was: jobhistoryserver)
                     (was: mr-am)
            Key: YARN-2251  (was: MAPREDUCE-5940)
        Project: Hadoop YARN  (was: Hadoop Map/Reduce)

> Avoid negative elapsed time in JHS/MRAM web UI and services
> -----------------------------------------------------------
>                 Key: YARN-2251
>                 URL: https://issues.apache.org/jira/browse/YARN-2251
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Zhijie Shen
>            Assignee: Zhijie Shen
>         Attachments: MAPREDUCE-5940.1.patch, MAPREDUCE-5940.2.patch
> Recently we observed a rare bug that an elapsed time of a reducer is going to 
> be negative on JHS web UI and via REST APIs. While the real reason for this 
> bug seems to be clock asynchronization on different hosts, the web frontend 
> should have masked the negative values. However, in the current code, 
> *org.apache.hadoop.mapreduce.v2.app.webapp.dao.** only check whether the 
> elapsed time is -1 or not.

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